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20.2. Enabling HA with Static Failover

Overview
링크 복사

To enable HA with static failover, you must do the following:
  1. Encode replica details in your service WSDL file
  2. Add the clustering feature to your client configuration

Encode replica details in your service WSDL file
링크 복사

You must encode the details of the replicas in your cluster in your service WSDL file. Example 20.1, “Enabling HA with Static Failover: WSDL File” shows a WSDL file extract that defines a service cluster of three replicas.

Example 20.1. Enabling HA with Static Failover: WSDL File

1<wsdl:service name="ClusteredService">
2    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica1">
        <soap:address location="http://localhost:9001/SoapContext/Replica1"/>
    </wsdl:port>

3    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica2">
        <soap:address location="http://localhost:9002/SoapContext/Replica2"/>
    </wsdl:port>

4    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica3">
        <soap:address location="http://localhost:9003/SoapContext/Replica3"/>
    </wsdl:port>

</wsdl:service>
The WSDL extract shown in Example 20.1, “Enabling HA with Static Failover: WSDL File” can be explained as follows:
1
Defines a service, ClusterService, which is exposed on three ports:
  1. Replica1
  2. Replica2
  3. Replica3
2
Defines Replica1 to expose the ClusterService as a SOAP over HTTP endpoint on port 9001.
3
Defines Replica2 to expose the ClusterService as a SOAP over HTTP endpoint on port 9002.
4
Defines Replica3 to expose the ClusterService as a SOAP over HTTP endpoint on port 9003.

Add the clustering feature to your client configuration
링크 복사

In your client configuration file, add the clustering feature as shown in Example 20.2, “Enabling HA with Static Failover: Client Configuration”.

Example 20.2. Enabling HA with Static Failover: Client Configuration

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jaxws="http://cxf.apache.org/jaxws"
       xmlns:clustering="http://cxf.apache.org/clustering"
         xsi:schemaLocation="http://cxf.apache.org/jaxws
         http://cxf.apache.org/schemas/jaxws.xsd
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica1"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>

    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica2"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>

    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica3"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>
    
</beans>
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